Hello. I have the same mobo and CPU as your build.
Audio doesn't work though (I didn't even realize that since I only use bluetooth speakers/ headsets most of the time).
Since everything else is fine (iMessage, iCloud, Handoff, bluetooth, wifi..). Do you think all the steps I need to do for audio to work may break it? I still think I can still live without audio ports, but it's nice to have everything working as a whole.
The real problem is that MultiBeast adds files to the EFI, but never subtracts them.
Some of these audio drivers need to be applied in a specific order.
If you try the right drivers out of order, it will never work.
You will need to restore from an earlier EFI folder,
(or just repeat steps 4 and 5 from the Installation to reinstall the OS (and the EFI) from scratch).
This actually a relief since I won't lose anything.
I was able to follow your instructions, and my audio ports work now. Just after a couple of restart .
Also at 6th step. I was also able to install this patch 200 / 300 Series /X299 Audio Device ID Patch. So I didn't use other.
I didn't understand why you copy the EFI to USB every single time, so didn't do that. But probably for backup right?
Problem though: My back ports work, the front ones do give me sound, but with breaking noises. What do you think can be the reason? Could it be I attached the front panel to my audio header the wrong way, of could be software problem?
If the back ones work, then audio is working. Congratulations.
It is possible you have not seated the front audio cable in the header correctly.
Also possible that the front audio jack itself is a bad component.
I take back what I said. My front audio also sounds like crap. Rear jack sounds fine, clear. Same speakers.
The cable is seated fine in the motherboard, so I now suspect the audio drivers.